Grinding machine



Oct. 27, 1936.

F. P. HEss GRINDING MACHINE Filed Feb. 6, 1936 Patented Oct. 27, 1936 g,PATENT" oFF-l The IEnterprise -Manufacturing Company of if;Pennsylvania, -Phi1adelphia,-,.Pa., a. corporationi oit,Pennsylvania` iApplication `February 6, 1936, Serial-'No.--62i699 *f 8 Claims.

Thisrfnventionfrelates tonew and^useful improvements -in` grinding,mills-and `more-particularly *to lmills: of the character L generallyused in grindingwcoffee,v spices,:and the-like.

Lk; The principal object-of the present-invention is to provideagrindingrmill lof the-character set i forthfhaving A [novel i meansautomatically operable `to permit thefmill tolcontinuein Voperationonlyso-long as--there'is any material therein `to 10 abe ground,V thus-eliminatingythe likelihood of -un due--wear land damage Which-mayvresult Vto the faces of the grinding elements should the? same A meansautomatically Voperable to maintain the l switch inVv closed relation-tooperatel said mill goligdur-ing grinding andvimmediately thereaftereffect theropening of said switch to stopthe mill. These'and` otherobjectsof the invention and thedetails .of -construotionfthereof are setforth' hereinafter` land `shown in fthe accompanying A drawing ,inwhich: 'f

Fig. 1 isa sectional elevation'of a grinding.

mill embodying,A the present invention. i

Fig-n2 is a fragmentary endrelevation of the lower portion of thesdisclosure in Figwl; and' W-v Fig,.3 is a diagrammatic vieu/.lof the`electric circuit employed in carrying `out theinventionx- Referring vnowmore particularly to thev draw-uy inge :referencenumeral l designatesgenerally vthe Y body or casing of a grinding millvhavinga hop,-

,per-Zmbntrolledebyla gate 3` to an vinlet 41andfan out1et;1 5 rontheground ematerial.4v A rotating grindingdisk` 6 is. secured ,-by.` meansof vscrews]l to the lnnerlfaceY of a flange 8 which projectsradiallyffrom a sleeve 9V slidablymountedn on a.

Vshaft-.gill Aforlrotationntherewithby means, of a keyior .the like. Il,saidshaftl being ,connectedn to anelectric motoreorother drive means I2.

The yright hand `endgof the sleeve Si,v with; respect to Figs-fd ofthe-drawing is helically.threadedY as. l, indicated; at I.3uorr,thewpurposei of ;convey1ng.

thermaterialfrom the'inlet. 4 :to a point between l0 by meansqf ascrew-l8 and tends to :force the grinding dislA 6; away from the grindingi;..the;. mill; for.;- grinding it is necessary @that the the.fgrindingdisk 6,; and a` second? grindingy fdisk I4.A spring -l;5 is)vdisposedabetweena shoulder@ I6 on theinnerwall of thef sleeve 9 andthead-ay giriner,I face of ai transverse-ly, extending f platmeLHl-lsecuredrto the innerendrof the shaft Y mounted Aupon, =the""inner`facente, flange '19M' inn parallelV spaced `relationwith respect to thegrinding ldisk 6. In the-present instance the" Harige-19""'projects-radially froma sleeve 20 'andV l extends'fto-the adjacentinner wall surface `of 5 themillfcasing I toinsurepassage of thema;terial to be'groundVV between the relatively op' yposed grinding'disksand |4respectively.. As' shownin'the drawing;the's1eeve 20 is mounted in*coaxial outwardly spaced relationwithrespect '10 to ltheisleeve 9 and'shaft HJ and is arranged for relativi-:"axial `movementwitl1"'respect'to the latter-for the purpcvse of adjusting vthe "grinding disk Irlwith respectto 'thegrin'ding -disk G to v-lary'the fineness ofthefgrin'ding operationfadl5 justment' ofV saidI sleeve 20 'beingeffectedbymea'ns of ascrew` 2| "actuated by a' sleevecap 22 located lexternallyof 'the ymill casing 'l1 V As sliownfin -`ligfl of thedrawinga pir"'23` is xe'dlymounted in the flange I9 of the 'sleeve "20Zand*proj'ects'laterally outwardly therefrorr`1"` .freely thrtnighanarcuate slot 'or "opening'-24 formedmythe-adjacent wall of the'casing" I to positively restrictrotation of said iiange I9 and" grindingdisks 'I 4 Within the I' limits `afforded by "said slot-or 'v opening f24: `An electric: "switch 25 ""connectednnthe V'circuit of the-motor`|'2 V'is mounted externally of the vmill casing l below/"the slotfpropeningi 24 so thatrthe operating arm or lever 26 "-thereof--projectsupwardly* intothe liniitedpath'of movementof theV aforementionedpin'ZBJ"ThsWitch--25 is preferably of a standard type constructed andarranged'fso `that a spring 21 therein tends to force the operating`armrorvleverZG to the:.positionl shown'in solid lines fFig'. L2 toopen-'the' motor-circuit'and Si stop thevmill; Land :a second spring `28connected- `.portiorra29 Lof theilcasingl-lf tends to rotates-aiddirectionrwith.respecteto saidIlFig-LQ andffretain theipin 23 atthexextr'emerightl-iand endof the- ;slotior `opening 12in:-

Referring..particularly,` to Fig: 2 of the draw- .vingpit willzbe.observedthatin order :to operate armnor .leverrZB 'of the'uswitch 25 beactuated-f to theleft; and heldifn thefpositionshown in dotted -linesagainst :thee combined action. of the springs .21 and-LM fo'rtheedurationiof: thevgrin'dinglopera-1` tioniztffThis'isisaccomplishedfin lthei i present instancel-.by thezfrotarmgrindingactioriaof the disk# `Ii upomltheamaterifal'fleeing'ground-.which exerts'l a corresponding rotative forcezupon the grindingNIW disk'illl,suiiicieni-,zto,V retain the pin l23 andiiswitchl 55 A arm 2t inthe aforementioned relationship. On the other hand, it will be obviousthat substantially simultaneously with passage of the last of thematerial outwardly from between the grinding disks 6 and i4 the springs2l and 28 will actuate the switch arm 26 and pin 23 into the relativepositions shown in solid lines in Fig. 2 of the drawing to open theswitch and stop the mill.

In operation of a grinding mill embodying the present invention, coffee,spices or other material is placed in the hopper 2 and the gate 3 openedso that said material passes through the inlet i ready to be conveyed tothe grinding disks 6 and lli by the threads I3 on the sleeve 9. To startoperation of the mill the pin 23 and switch arm or level` 2t areactuated manually or by means of a lever into the position shown indotted lines in Fig. 2 to close the switch 25, the pin 23 being held inthis position for several seconds of time to allow the grinding disk tocome up to speed and begin to grind the material. Manual control of thepin 23 may then be relinquished and the aforementioned rotative forceexerted upon the disk M by the action of the grinding disk ii upony thematerial being ground will retain said pin 23 and switch arm 26 in theposition to which actuated until the last of the material to be groundhas passed outwardly from between the grinding disks 6 and I4 at whichtime the spring 28 and the switch spring 2l immediately actuate said pin23 and switch arm 2G to the right as shown in solid lines to open theswitch and stop the mill.

While the foregoing description of the inven- Ition includes adiscussion of the construction and `solid lines in Fig. 2 at thecompletion of a grinding operation, and although the present descriptionis otherwise limited to a specic embodiment of the invention, it' is notintended that said invention be precisely limited thereto but thatchanges and modications may be made in the details oi constructionwithin the scope of the annexed claims.

I claim:

, 1. In a grinding mill of the character described, a rotatable grindingdisk, means movable with said grinding disk, a switch located in thepath of travel of said last mentioned means, means tending to open theswitch, a motor controlled by said switch, and a second grinding diskhaving driving connection with said motor arranged with respect to therst grinding disk so that when the first mentioned means is actuated toclose the switch to start the motor, the action of the second grindingdisk and material being ground upon the first grinding disk functions toretain said rst mentioned means in the position to which actuated tomaintain said switch closed for the duration of the grinding operation.

2. In a grinding mill of the character described, a rotatable grindingdisk, means movable with said grinding disk, a switch located in thepath of travel of said last mentioned means, means tending to open theswitch, a motor controlled by said switch, a second grinding disk`having driving connection with said motor arranged with respect to theiirst grinding disk so that when the first mentioned means is actuatedto close the switch to start the motor, the action of the secondgrinding disk and material being ground upon the first grinding diskfunctions to retain said rst mentioned means in the position to whichactuated to maintain said switch closed for the duration of the grindingoperation, and means operable without interfering with the control andoperation of the switch for adjusting the rst mentioned disk withrespect to the second disk to vary the degree of iineness of the grind.

3. In a grinding mill of the character described, a rotatable grindingdisk, means movable with said grinding disk, a switch, an operatinglever for said switch movable in the path of travel of said lastmentioned means, means acting on said operating lever tending to openthe switch, a motor controlled by said switch, and a second grindingdisk having driving connection with said motor arranged in parallelspaced relation with respect to the first grinding disk so that when therst mentioned means is actuated to engage the operating lever and closethe switch to start the motor, the action of the second grinding diskand material being ground upon the iirst grinding disk functions toretain said rst mentioned means in the position to which actuated tomaintain said switch closed for the duration of the grinding operation.

4. In a grinding mill of the character described, a rotatable grindingdisk, means movable with said grinding disk, a switch, an operatinglever for said switch movable in the path of travel of said lastmentioned means, means acting on said operating lever tending to openthe switch, a motor controlled by said switchy a second grinding diskhaving driving connection with said motor arranged in parallel spacedrelation with respect to the iirst grinding disk so that when the firstmentioned means is actuated to engage the operating lever and close theswitch to start the motor, the action of the second grinding disk andmaterial being ground upon the iirst grinding disk functions to retainsaid first mentioned means in the position to which actuated to maintainsaid switch closed for the duration of the grinding operation, and meansoperable without interfering with the control and operation of theswitch for adjusting the first mentioned disk with respect to the seconddisk to vary the degree of fineness of the grind.

5. In a grinding mill of the character described, a grinding disk,rotatable within predetermined limits, means movable with said grindingdisk, a switch loc-ated in the path of travel of said last mentionedmeans, springs respectively tending to open the switch and maintain thegrinding disk and the i'lrst mentioned means at one limit of rotation, amotor controlled by said switch, and a second grinding disk havingdriving connection with said motor -arranged in parallel spaced relationwith respect to the first grinding disk so that when the rst mentionedmeans is actuated to close the switch to start the motor, the action ofsaid second grinding disk and the material being ground upon the iirstgrinding disk functions to retain said rst mentioned means in theposition to which actuated against the action of the springs to maintainsaid switch closed for the duration oi the grinding operation.

6. In a grinding mill of the character described, a grinding diskrotatable within predetermined limits, means movable with said grindingdisk, a

switch loc-ated in the path of travel of said last mentioned means,springs respectively tending to open the switch and maintain thegrinding disk and the first mentioned means at one limit of rotation, amotor controlled by said switch, a second grinding disk having drivingconnection with said motor arranged in parallel spaced relation withrespect to the iirst grinding disk so that when the rst mentioned meansis actuated to close the switch to start the motor, the action of saidsecond grinding disk and the material being ground upon the firstgrinding disk functions to retain said first mentioned means in theposition to which actuated against the action of the springs to maintainsaid switch closed for the duration of the grinding operation, and meansoperable without interfering with the control and operation of theswitch for adjusting the first mentioned disk with respect to the seconddisk to vary the degree of neness of the grind.

'7. In a grinding mill of the character described, a grinding diskrotatable within predetermined limits, means movable with said grindingdisk, a switch, an operating lever for said switch movable in the pathof travel of said last mentioned means, springs acting respectively onsaid operating lever tending to open the switch and on the grinding disktending to maintain the latter and the first mentioned means at onelimit of rotation, a motor controlled by said switch, and a secondgrinding disk having driving connection with said motor arranged inparallel spaced relation with respect to the first grinding disk so thatwhen the rst mentioned means is actuated to engage the operating leverand close the switch to start the motor, the action of said secondgrinding disk and the material being ground upon the first grinding diskfunctions to retain said rst mentioned means in the position to whichactuated against the action of the springs to maintain said switchclosed for the duration of the grinding operation.

8. In a grinding mill of the character described, a grinding diskrotatable Within predetermined limits, means movable with said grindingdisk, a switch, an operating lever for said switch movable in the pathof travel of said last mentioned means, springs acting respectively onsaid operating lever tending to open theswtch and on the grinding disktending to m-aintain the latter and the rst mentioned means at one limitof rotation, a motor controlled by said switch, a second grinding diskhaving driving connection with said motor arranged in parallel spacedrelation with respect to the rst grinding disk so that when the rstmentioned means is actuated to. engage the operating lever and close theswitch to start the motor, the action of said second grinding disk andthe material being ground upon the rst grinding disk functions to retainsaid first mentioned means in the position to which actuated against theraction of the springs to maintain said switch closed for the durationof the grinding operation, and means operable without interfering withthe control and operation of the switch for adjusting the rst mentioneddisk with respect to the second disk to vary the degree of fneness ofthe grind.

FREDERICK P. HESS.

